词典双键
双键
词语解释
双键（雙鍵）[ shuāng jiàn ]
⒈ 在化合物分子中两个原子间以共用两对电子而构成的键。通常用两条短线“＝”表示。如乙烯(ch2＝ch2)、丙酮(h3ccch3o)等分子中的键。[hj]
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